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server.go
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server.go
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package grpc
import (
"fmt"
"net"
"reflect"
)
import (
"github.com/grpc-ecosystem/grpc-opentracing/go/otgrpc"
"github.com/opentracing/opentracing-go"
"google.golang.org/grpc"
)
import (
"github.com/apache/dubbo-go/common"
"github.com/apache/dubbo-go/common/constant"
"github.com/apache/dubbo-go/common/logger"
"github.com/apache/dubbo-go/config"
"github.com/apache/dubbo-go/protocol"
)
// Server ...
type Server struct {
grpcServer *grpc.Server
}
// NewServer ...
func NewServer() *Server {
return &Server{}
}
// DubboGrpcService ...
type DubboGrpcService interface {
SetProxyImpl(impl protocol.Invoker)
GetProxyImpl() protocol.Invoker
ServiceDesc() *grpc.ServiceDesc
}
// Start ...
func (s *Server) Start(url common.URL) {
var (
addr string
err error
)
addr = url.Location
lis, err := net.Listen("tcp", addr)
if err != nil {
panic(err)
}
// if global trace instance was set , then server tracer instance can be get. If not , will return Nooptracer
tracer := opentracing.GlobalTracer()
server := grpc.NewServer(
grpc.UnaryInterceptor(otgrpc.OpenTracingServerInterceptor(tracer)))
key := url.GetParam(constant.BEAN_NAME_KEY, "")
service := config.GetProviderService(key)
ds, ok := service.(DubboGrpcService)
if !ok {
panic("illegal service type registered")
}
m, ok := reflect.TypeOf(service).MethodByName("SetProxyImpl")
if !ok {
panic("method SetProxyImpl is necessary for grpc service")
}
exporter, _ := grpcProtocol.ExporterMap().Load(url.ServiceKey())
if exporter == nil {
panic(fmt.Sprintf("no exporter found for servicekey: %v", url.ServiceKey()))
}
invoker := exporter.(protocol.Exporter).GetInvoker()
if invoker == nil {
panic(fmt.Sprintf("no invoker found for servicekey: %v", url.ServiceKey()))
}
in := []reflect.Value{reflect.ValueOf(service)}
in = append(in, reflect.ValueOf(invoker))
m.Func.Call(in)
server.RegisterService(ds.ServiceDesc(), service)
s.grpcServer = server
go func() {
if err = server.Serve(lis); err != nil {
logger.Errorf("server serve failed with err: %v", err)
}
}()
}
// Stop ...
func (s *Server) Stop() {
s.grpcServer.Stop()
}